Re: [PATCH v2] x86: Remove compat vdso support

[Andy Lutomirski]

On Wed, Mar 12, 2014 at 2:46 PM, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> On Wed, Mar 12, 2014 at 2:37 PM, H. Peter Anvin <hpa@xxxxxxxxxxxxxxx> wrote:
>>
>> How would that deal with the legacy vsyscall case for x86-64?  Just rely
>> on the "legacy vsyscall emulation" (which seems to have its own class of
>> problems...)?
>
> It does?
>
> We *default* to emulation, and have for over two years now (since
> v3.4).  If there are problems with it, we need to fix those.

Even in the non-default "vsyscall=native" case, the vsyscall pages
just contains syscalls.  It does not need to access the vvar page, the
hpet, or anything else that the vdso uses.

>
>            Linus



-- 
Andy Lutomirski
AMA Capital Management, LLC
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